Add BytesRead metric to CPM

chrome/browser/performance_monitor/metric_details.cc

Index: chrome/browser/performance_monitor/metric_details.cc
diff --git a/chrome/browser/performance_monitor/metric_details.cc b/chrome/browser/performance_monitor/metric_details.cc
index 98d3a975898e0f3c151828e5dba6425bf99b07ea..7a8ce818423783bd0f1366e6b6a5fb44ba06b0b0 100644
--- a/chrome/browser/performance_monitor/metric_details.cc
+++ b/chrome/browser/performance_monitor/metric_details.cc
@@ -65,6 +65,13 @@ const char kMetricPageLoadTimeDescription[] =
 const char kMetricPageLoadTimeUnits[] = "microseconds";
 const double kMetricPageLoadTimeTickSize = 30000000.0;
 
+// Bytes Read
+const char kMetricBytesReadName[] = "Bytes Read";
+const char kMetricBytesReadDescription[] =
+    "The number of bytes read across the network.";
+const char kMetricBytesReadUnits[] = "bytes";
+const double kMetricBytesReadTickSize = 2000000.0;
+
 // Keep this array synced with MetricTypes in the header file.
 // TODO(mtytel): i18n.
 const MetricDetails kMetricDetailsList[] = {
@@ -109,6 +116,12 @@ const MetricDetails kMetricDetailsList[] = {
     kMetricPageLoadTimeDescription,
     kMetricPageLoadTimeUnits,
     kMetricPageLoadTimeTickSize
+  },
+  {
+    kMetricBytesReadName,
+    kMetricBytesReadDescription,
+    kMetricBytesReadUnits,
+    kMetricBytesReadTickSize
   }
 };
 COMPILE_ASSERT(ARRAYSIZE_UNSAFE(kMetricDetailsList) == METRIC_NUMBER_OF_METRICS,